Posted by MarkB_MI on September 30, 2019 at 02:28:24 from (174.230.11.254):
In Reply to: Master shut off switch posted by Plowhand on September 29, 2019 at 17:14:09:
I assume you're talking about one of those knife switches that attach directly to the battery post, as opposed to a switch you mount elsewhere. The reason for putting them on the negative cable is to prevent unintentional arcing should the switch touch the frame. Functionally they will work on either post, but just like you should always remove the negative cable first and install it last, it's safer to switch the ground.
That said, if you have a current draw that you want to stop, it doesn't matter which post it's on. Either way the switch takes the battery out of the circuit. So put it on the negative post unless it won't physically fit there.
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